The Study of Supercapacitive Stability of Mno2/Mwcnt Nanocomposite Electrodes by Fast Fourier Transformation Continues Cyclic Voltammetry Publisher



Naderi HR¹ ; Reza Ganjali M^{1, 2} ; Norouzi P^{1, 2}
Source: International Journal of Electrochemical Science Published:2016

Abstract

In this work, the nanostructured MnO2 was uniformly coated on the multi-walled carbon nanotube (MWCNT) by a sonochemical method, and the effect of MWCNT amount on the supercapacitive performance of the nanocomposites were investigated. The structure and morphology of the nanocomposites were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), transition electron microscopy (TEM) and scanning electron microscopy (SEM). Also, the specific capacitances (SCs) of the MWCNT/MnO2 electrodes were studied by cyclic voltammetry (CV). The result shows that the loading the nanocomposite with of MnO2 was 65 wt. %, the electrode has a high SC of 394 F g-1 (at scan rate of 2 mV s-1 in a 0.5 M Na2SO4) indicating a better performance than that of pristine MnO2 electrodes (289 F g-1 at scan rate of 2 mV s-1). Fast Fourier transformation continuous cyclic voltammetry (FFTCCV) technique was used to study stability and separation of charge and discharge curves of the nanocomposite electrodes, over a large number of cycles (at scan rates 200 mV s-1). The results indicated SC that the capacitance of the composite electrode decreases only 3.2% of initial capacitance, after 4000 cycles. Therefore, the prepared composite could be potential electrode materials for supercapacitors. © 2016 The Authors.